Well, that is what God said in

Genesis 6:17. So since we are all believers in God's Word there is no question about "who" brought the flood ! But, for Demetrius, Kevin and others, they say God really didn't do it, He "withdrew His Presence" and then the earth just went wild ! God "lost control of nature"  says Demetrius & Kevin !

 Hebrews 1:3  "Who being the brightness of His glory, and the express image of His Person, and upholding ALL THINGS  by The Word of His power,...." 

Would the "ALL THINGSinclude what is called the elements of nature ? Well we do not find any other definition in the dictionary, ALL means ALL ! Then God is in control of ALL Things; ALL THE TIME, and they never get out of GOD'S control ! Let us hear The Word of The Lord in Psalms 33: 6 & 9 > 

 "By the Word of The Lord were the heavens made and all the hosts of them by the breath of His mouth..for He spake and it was done, He commanded and it stood fast" ! 

  I must say that it is error indeed to ever say that "nature" gets out of God's control !  

"At His own will God summons the forces of nature to overthrow the might of His enemies, -"fire, and hail; snow, and vapours; stormy wind fulfilling His Word." Psalm 148:8. 

Speaking about Joshua commanding the sun and the moon to stand still on Gibeon, The Spirit of God says: 

"This mighty miracle testifies that the creation is under the control of The Creator. Satan seeks to conceal from men The Divine Agency in the physical world--to keep out of sight the un- wearied working of the first great cause. In this miracle all who exalt nature above the God of nature stand rebuked."

 "This mighty miracle testifies that the creation is under the control of The Creator.

 Well, for those who believe the Word of God, it is very simple, God is in absolute control of nature every moment and God commanded the clouds, the thunder and lightning, the wind, and the rain to fall upon the earth for forty days and forty nights and God commanded the waters which were under the earth at that time to burst forth with terrific force until the world that then was was covered 15 cubits above the mountains and every thing in which was the breath of life perished except for Noah, His Family, and the animals in the ARK !

God didn't just turn His back and close His eyes and let nature go on a rampage !  Remember: it had never rained before; neither the Devil or the people had ever seen clouds, or rain, or heard the roar of thunder and seen the blinding flash of lightning, it had never happened before anywhere in all of God's endless universe ! That is right Friends, only this planet in rebellion has experienced this great and terrifying demonstration of God's power ! It was the result of sin, the transgression of God's Law ! 

"There is scarcely an operation of nature to which we may not find
reference in the Word of God. The Word declares that "He maketh His sun to rise,",  "the rain to descend." He "maketh grass to grow upon the mountains. . . . He giveth snow like wool: he scattereth the hoar-frost like ashes. He casteth forth His ice like morsels: . . . He sendeth out His Word, and melteth them: He causeth His wind to blow, and the waters flow." "He maketh lightnings for the rain; and bringeth the wind out of His treasuries."

Advent Review and Sabbath Herald November 8, 1898 

 When God commanded Elijah to go tell Ahab that there would be neither due nor rain for 3 years +, the people were unwilling to admit that God had sent  the famine ! God's Spirit says:

"Yet notwithstanding these evidences of God's power, Israel repented not, nor learned the lesson that God would have them learn. They did not see that He who created nature controls her laws, and can make of them instruments of blessing or of destruction."

Prophets and Kings Page 125

Anyone still think that God just let nature go wild in producing the flood ? Yes, sorry to say, but, there will still be those who just like Israel,  will not be willing to admit they have been in error ! The "nature" of the "carnal man" hasn't changed !